Originally Posted by MidnightShift
Just tapped a keg of this I brewed about 4 weeks ago. Made some mistakes like missing my strike temp by 2 degrees (148).
Here's what I use to calculate my strike temp.
Strike Water Temperature Tw = (.2/r)(T2 - T1) + T2 where
r = The ratio of water to grain in quarts per pound.
T1 = The temperature of the grain
T2 = The target temperature of the mash.
For 13 lbs of grain mashed at 1.25 quarts per pound, with grains that are 60 degrees and a desired mash temp of 150, the strike temp = 164.4.
I will heat my strike water to around 175, pour 16.25 quarts (1.25 x 13) of it into the mash tun and preheat it for 10 minutes, then stir if necessary until its 165 degrees. At that point I'll stir in the grains. I'm usually +/- half a degree doing it this way.